### 无阀式脉冲爆震火箭发动机运行稳定性实验

1. 1. 西北工业大学 动力与能源学院, 西安 710072;
2. 西北工业大学 陕西省航空动力系统热科学重点实验室, 西安 710129
• 收稿日期:2020-05-07 修回日期:2020-07-11 发布日期:2020-08-07
• 通讯作者: 王可 E-mail:wangk@nwpu.edu.cn
• 基金资助:
国家自然科学基金（91641101，91441201）；陕西省自然科学基础研究计划（2020JQ-185）；中央高校基本科研业务费专项资助（3102018AX006，3102019ZX024）

### Experiment on operation stability of valveless pulse detonation rocket engine

TAN Fengguang1, WANG Ke2, YU Xiaodong1, WANG Yun1, LI Qing'an1, FAN Wei1

1. 1. School of Power and Energy, Northwestern Polytechnical University, Xi'an 710072, China;
2. Shaanxi Key Laboratory of Thermal Sciences in Aeroengine System, Northwestern Polytechnical University, Xi'an 710129, China
• Received:2020-05-07 Revised:2020-07-11 Published:2020-08-07
• Supported by:
National Natural Science Foundation of China (91641101, 91441201); Natural Science Basic Research Program of Shaanxi Province(2020 JQ-185); the Fundamental Research Funds for the Central Universities (3102018AX006, 3102019ZX024)

Abstract: Despite the ability of the valveless scheme to produce high frequency detonations, the problems leading to unsteady operations such as deflagration, ignition failure, and discrepancy in frequencies of operation and ignition are not clear. To study the influence of supply conditions on steady operations of the pulse detonation rocket engine, experiments have been conducted based on the valveless mode. Ethylene and oxygen-enriched air have been utilized as fuel and oxidizer, respectively. Influence of the oxygen volume fraction on the operation stability has also been analyzed. The results indicate that steady detonations are available only when the equivalence ratio is within a proper range, i.e., 1.2-1.7 and 0.8-2.3, when the oxygen volume fractions of 40% and 66% are used, respectively. The range of the equivalence ratio increases for producing detonation when the oxidizer with the volume fraction of 66% is used. In addition, pressure oscillations near the closed end of the detonation tube will propagate upwards to the supply passages when fully-developed detonations are produced, and thus flow oscillations, with a frequency times of the detonation frequency, will be induced inside the supply passages. However, the flow oscillations appear disorderly if steady detonations are not obtained in the detonation tube. Since the disorderly flow oscillations inside the supply passages will further influence the operation stability, measures to control them should be considered.